Electrical measuring instrument.



No. 819,07. PATENTED MAY l, 1906. F1 A. LA ROCHE L M. C. RYPINSKI.

ELECTRICAL MBASURNG INSTRUD/.ILNTJ .ED No APPLICATION FIL 1.8. 1904.

PATENTED MAY l, 1906. 0. RYPINSKI.

No. (919,071y

I'. A. LA ROCHE a M. ELECTRICAL MEASURING INSTRUMENT.

APPLICATION .FILED NOV.8,1904.

2 SHEETS-SHEET 2,

WFWI

N'IIED STATES PATENT FFICE.

FREDRICKA. LA ROCHE AND MAURICE C. RYPINSKI, OF NEW YORK, N. Y:

ELECTRICAL MEASUFHNC-, NSTRUMENT.

Specification of Letters Patent.

Patented May 1, 1906.

Application led November l?, 1904. Serial No. 281,926..

To al] r/z/om it nifty concern.-

l'e it known that we, FREDRroK A. LA .conn and Miimircn C. RYPiNsKr, citizens the `United States, and residents oi New rl: city, New York, (post-oiiice address No. .ndson street, New York city, New erle) have invented a new und useful Improveinent in Electrical Measuring Instruwhich is tu lly set forth in the Ifollowing A. icntion.

This invention relates to electrical measuring instruments containing e movable pointer whose angular-movement is directly proportional to the amount of current passing through the instrument.

The invention consists of the construction and arrangement of the parts, as hereinafter pointed out and claimed. It will be best understood hy reference to the accompanying drawings, that illust-rete one embodiment of our invention.

In the drawings, Figure 1 shows the fece of our instrument in a suitable case adapted. to be fastened on the wall or upon a switchboard, but the view will be referred to `as a pien view. F ig. 2 is an end 'view or' the same instrument .removed from its case. Fig. 3 is a sectional view oi the same through the lines III III of Fig. l. Fig. l is a. sectional view through the lines IV IV or" Fig. l. Fig. 5 is a perspective or' the center piece, and Fig. 6 is a detail of e modification. il. av center piece, preferably of brass, substentiallyin the shape of the letter F in crosssection and provided with two pairs of forwardly-extending horizontal arms c, as seen in Fig. 5, and also provided with e. rearwardl extendingfoot a', ada' ted to be secured to t ie back or the bottom o the instrument-case B.

O re resents a (brass) bridgepiece, held out a iifref' distance from the upper arms av of the center piece by screws c, sleeves c', and insu# lation c. A similar bridge-piece C is supe ported in like manner below the two lower arn'is'e. l

'represents four flat rectangular plates of {soit} iron, each secured in any convenient manner to the inner fece of one of the four ernis c. i)relierebly the rear portion of center piece A 'ill .be groovedout to form seats d ier these plates D to hold them more rigidly in position.

IC represents a. ermanent U-shaped niagnet whose iorwer ends ere slotted out to receive the four plates D which letter are firmly l secured in these slots, and thus constitute pole-pieces for the magnet.

F is :i disk of (soft) iron, supported concentrically of the system midway between the upper and lower plates D. .Preferably the rear oi disk F isinserted into 'a suitablejseat in the back of center piece A and is held there by e pin f, as seen in Fig. 4. Similar pins may serve 'to secure the pIartes lD to the center piece A. It will thus be seen that thel magnetis supportedby its oleieces D, which latter are sup orted gy pieces A, and that the ridge-pieces C und C :ire supported by screws and sleeves, Awhich latter ere supported by the center piece-in other words, that the whole system is supported upon the center piece A.

G represents the moving coil, shown as reotangular in form and consisting of e. number `of turns oiline wire properly wound upon :i copper damping-frame and adapted. to travel in tne four air-gaps between the opposing faces of the four pole-pieces D and the core F, ell as seen in Fig. 3. The moving coil G provided with two oppositely-dis osed hubs g g', to each of which is secured a lament Il,

C in a manner to bo described, while u on the upper hub is mede fast the pointer that sweeps over the scalelate Gf.

In the center or' eac i bridge-piece is a hollow plu(r J, through which the filament II (preferably a flattened filament)v is passed, being mede fest at the top. A coil-spring y' bears against the shoulder ot' each plug J to coil G in proper' osition but in practice only one spring may e used. For the pur ose of adjustment and calibration the plug is rovided with a longitudinal groove j, (see ig. 1,) which engages the tongue of an annular late K, that isilield in place b f another plate ii, which. in turn is secured to the bridgeiece by screws. To `adjust the position o the moving coil with its pointer G', Afirst loosen the screws f pla-te L, then partially rotate plate Iii by means of its arms c, and then tighten the screws of plate L. At M is shown the` usual high resistance in series with the movingcoil G to adapt the instrument for be cut out of circuit and the instrument used with e resistance in parallel circuit :is an ernmeter.

t e centerthat in turn is connected to the bridge-piece tauten the filament H and hold the moving use as a voltmeter. This resistance M may In Fig. 6 is shown a. modification in which IOO . about midway its length to form a bearing.

' in place.

the passage through the plug VJ is contracted for the filament H, and across thetop of the plu is an inverted keyhole-slot j. The end of ament H is passed through the lug J and thenforced down into slot j and so dered n To tauten the ilament, remove the soldering, loosen the end of the filament, stretch the lilament the desired amount, and then restore to lace and solder it as before.

Current is le into the instrument .through one of the two binding posts B, thence through connections b to one ofthe arms k', to the plu J and filament H, and to the hub g and Win ings G, and the current passes out through a similar courseto the outerpost B. At b the connections from the instrument are soldered to connections from the bindingposts, so that by removing the solder the instrument can be taken'from its case vafter the screws have been taken lout of the footV a.

The fields efforce between the pole-pieces D andthe core F are permanent, constant, and.,

uniformly intense. The el'ect of the passage of a given current through the windings G is therefore uniform and constant, and the angular movement of the moving coil with its'pointer G is exactly roportional to the low of current through t e instrument,- and I the markin s on the scale-plateare equidistant. It will be noted that the ilaments serve a threefold purpose-they act as positive supports for the moving coil, (Which is not pivoted,) they lead current into and out of the moving coil, and their torsion serves to restore the coilwith its pointer, to the initial position. The compactness andV siniplicity of our instrument are notable. F-shaped center pieceA may be made by. the three o erations of' milling, drilling, and tapping. he same is true of the permanent magnet, which has only to be bent, milled, hardened, magnetized, and aged, thus eliminating such expensive operations as drilling, tapping, and grinding. All the otherparts are simple and inexpensive iii-construction permanent U-shaped magnet sup orted by said pole-pieces, an insulated bri ge-piece supported above said center piece, a similar each of saidy bridge-piece below the same, iilaments ex tending between said brid e-pieces and supportin a moving coil, an said moving coil locate 4in the at iields of force between said fields and said plates. 2. In an electrical measuring instrument, the combination of a center piece providing supports for four pole-piecesand for a centrally-disposed core between the same, said pole-pieces and core, and a permanent U- shaped magnet supported by said polepieces,

two bridge-pieces supported from said center Awhich theend of the ilam'ent is secured, said plug being axially adjustable in a ixed suport. p 5. In anelectrical measuring instrument, the combination of a permanent magnet hav-v ing four flat pole-pieces, a softiron core supported centrally of the latter to provide four iiatuniform andintense fields of force, and va moving coil' of substantially-rectangular shape surrounding said core and'suspended within said ields of force by two .filaments havin electrical connection therewith .and with t e binding-postsof the instrument.

' 6.' In 'an'el'ectrical measuring instrument, the combination of a magnet having four flat pole-pieces and a centrally-disposedcore outlining fields ofmagnetic force,amoving c oil located within said fields .of force, oppo- ,sitely-disposed ilaments for suspending said moving coil, and means for supporting and adjusting said laments.

v.7". In an electrical measuring instrument, the combination of a permanent magnethaving four fiat pole-pieces, a core centrally dis# posed between said` pole-pieces and serving with them to'outline four at .fields efforce, a moving coil surrounding said core and located within -said fields of force, two 0ppm sitely disposed filaments carrying said coil, supports` for saidlaments and af yielding device interposed. between said' supports. f

` 8. in an electrical measuring-instrument, the conibinationoi a permanent magnet hav'- ing four at pole-pieces, a core centrally disposed betweerr'said pole-pieces and serving with them tovoutline four atields offeree, a moving coil surroundingsaid core and located within said fields of force, two oppo- -sitely disposed :Elements carrying said coil,

and supports forsaid iilaments one or beth of said supports being adjustab e. y

y9. ln an electrical measuring instrument,v

IOO

IXO

or both of said supports being adjustable.

l0. ln an electrical measuring instrument, the combination of a permanent magnet and a core therefor outlining an intense field of force, a movable coil located in said field of force, means for supporting said coil consisting of two oppositelydisposed filaments, a support for each filament,` each of said supports being provided with means for adjust' ing its filament axially without affecting it longitudinally.

i l. in an electrical measuring instrument, the combination of a permanent magnet and a core therefor outlining an intense field of force, a movable coil located in said field of force, means for supporting said coil consisting of two op ositely-disposed filaments, a support for eac filament, each of said supports being provided with means for adjusting its filament longitudinally without moving it axially.

12. In an electrical measuring instrument, the combination of a permanent magnet and a core therefor outlining an intense field of force, a movable coil located in said field of force, means for sup orting said coil consisting of two opposite y-disposed filaments, a support for each filament, each of said suports being provided with means for adjusting its filament axially Without affecting it longitudinali and also with means for adjusting the filament longitudinally without moving it axially.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

FREDRICK A, LA ROCHE. MAURICE C. RYPINSKI. Witnesses:

A. M. BOTTCHER, G. M. MACVILLIAM. 

